Vine, Twitter’s new video sharing app, has been criticized so much over the past week for its so-called “porn problem.” Searching for certain suggestive hashtags on the service would lead you to some five-second clips of sexytime.

Apple doesn’t like scandal, especially concerning genitalia, and the immediate solution was to cut Vine from the list of Editor’s Picks in the App Store.

But that wasn’t enough. On Tuesday, Vine released an update to its app. Now, when users update the Vine app or download it for the first time, they will see a “17+” age-restricted material warning.

Apparently Apple reminded Twitter of Clause 3.8 from the App Store guidelines, which reads:

Developers are responsible for assigning appropriate ratings to their apps. Inappropriate ratings may be changed by Apple.

In other words, Apple gave Twitter a warning, implying that Twitter might want to change its maturity rating—otherwise, Vine could have faced ejection. Twitter complied.

Neither company is responding to requests for comment.